Was told that about three weeks ago, a mech at CLT was working on AirBus (don't know which one) and he had started up APU as part of his checks, he exited out the Avionics Bay service door and then went up the crew ladder to enter the aircraft, when he tried to open the entry door, the handle popped into his face and threw him down the stairs, the door opened with such force that the aircraft was "dented" on the outside skin (?) and it is believed that the aircraft must have "pressurized" when he closed up the avioncis bay door, again this happened about 3 weeks ago and I have seen nothing published via company regarding the incident in the way of FSR or other communications.